I love that BBEdit plays any QuickTime file. I can view images, play movies, listen to MP3s, all from BBEdit. QuickTime is so cool that it can do this. As new QuickTime media types are supported, they get automatically supported by other apps. YAY.
Of course, I don't use BBEdit as my media player / image viewer / whatever, but it is good if I just want to see/hear something quickly without loading in another app.